I have Win7U x64, updated automatically until recently.
I was having some problems with IE9, virus???, spyware???, etc. Microsoft FixIt, MSSE, Panda ActiveScan, and various online scanners were unable to smooth out my problems. I decided to revert to IE8 and then reinstall IE9 after cleanup and reboot. I went
into installed programs, windows options, and unchecked IE, and rebooted.
IE9 was still there! And still flaky (confirmation windows invisible, clicks have no effect until after reload, etc.)! I tried the solutions on here with no success.
On 12/21/2011 "Windows Internet Explorer 9 for Windows 7 for x64-based Systems" failed with error code 9C48.
All other updates are successful.
When I try the IE9 x64 installer from Microsoft.com, it reports a newer version already installed. When I try the x86 installer from MSN.UK, it reports incompatible w/ x64 Windows.
I would appreciate ANYONE with suggestions.